Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4b18df0ba169e0…

MALICIOUS

PDF

94.0 KB Created: 2020-11-24 22:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dc12aa5dc9e3c84386554c5deb9a9378 SHA-1: db2c5576e28bf375eb78822802445984d03a7aba SHA-256: 9b4b18df0ba169e013767b0b374731988ddafe9c91ab1ac62fa820df1702cddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/strik?utm_term=i+am+cait PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fa766dbab884.pdfIn PDF document text
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/kexesuxeseru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5fa7410bdc901.pdfIn PDF document text
    • https://gososeru.weebly.com/uploads/1/3/4/5/134597059/rivepiwalefumatop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5fb432bf9348c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5f9cfe0fa2284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3566ab-6cf4-4ba9-b754-92213a44813c/mokugepajejaximepazowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8625fe8a-537b-45c4-8208-0ad754014e5b/93216980775.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/odia_new_movie_blackmail_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/mastering_bitcoin_2e.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 4576 bytes
SHA-256: caeff0e426be1d003df4c3a7458b69cf919e55356411979417e43f84b8f15e3e
font_01_sfnt_off000142ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 12300 bytes
SHA-256: 6e45121917b5b57fd01f0f34d08ea1df1cd0ebac71179a7446a9a9d93c1a72a7